| Two-tower connecting buildings with large bases have special forms.They can not only effectively use the space resources and improve the utilization of terrestrial resources,but also can meet the requirements of investors.So,the two-tower connecting buildings with large bases becomes of high-rise buildings in cities a hot spot.Based on the research informations at home and abroad,the seismic response characteristics of two-tower connecting structures with large bases have been studied in this thesis.The main research results include the following six areas as followings:(1) By using the ANSYS software, the three dimensional entity finite element model, which is a two-tower connecting building with large bases of contour jointed body structure was established, and the correctness of this model and the computational method was confirmed.(2) By using the ANSYS software, the three dimensional entity model, which is a two-tower connecting building with large bases of contour jointed body structure was established, the dynamic behavior of this structure was analyzed. The findings had indicated that the union body had a big influence on the low-level vibration mode of the two-tower connecting building with large bases, while had a small influence on the high-level one. The change of the connector's bearing way had a small influence on the low-level dynamic characteristics of this structure, while had a big influence on the high-level one. The rigidity difference of the connector had little influence on the vibration mode of the symmetrical structure.(3) By using the ANSYS software, the three dimensional entity model, a two-tower connecting building with large bases of jointed body structure, which was not contour was established, the dynamic behavior of this structure was analyzed. The findings had indicated that the setting of the connector had affected the structure's frequency and vibration mode of each level greatly. Compared with unjointed bodies, corresponding cycle of the structure's vibration mode in each level reduced and the rigidity became stronger after the connector was set. As to the two-tower connecting building with large bases of jointed body structure which was not contour. The difference of the connector's position had little influence on the vibration mode of the structure.(4) By using the decomposition reaction spectral method of the vibration mode, the earthquake response of the two-tower connecting building with large bases of contour jointed bodies structure was analyzed. The findings had indicated that because of the influence between the two tower plat form of the two-tower connecting building with large bases of contour joined bodies structure was very small, whether there was a union body as well as the change of union body's position had a small influence on the dynamic reaction of the two-tower connecting building with large bases of contour jointed bodies structure. The weak point of the two-tower connecting building with large bases of contour jointed bodies structure was the tower platform, not the connector.(5) By using the decomposition reaction spectral method of the vibration mode, the earthquake response of the two-tower connecting building with large bases of jointed bodies structure, which was not contour was analyzed. The findings had indicated that connector affected the floor's shearing force obviously under the effect of quake. The sudden change of the rigidity made the shearing force, the up floors of the connection between the tower plat form and the jointed body, much bigger than the down floors. As to the unsymmetrical two-tower connecting building with large bases structure, the upper part of spandrel rooms among tower platforms faced a bigger force, which was the structure's weak point and needed enhancing when designed.(6) By using the method of time interval analysis, the analytic result of dynamic response of the two-tower connecting building with large bases jointed bodies structure indicated that the connecting effect of the jointed body was small as to the two-tower connecting building with large bases of contour joined bodies structure, while as to the two-tower connecting building with large bases of joined bodies structure which was not contour, the connector would reduce the dynamic response of the top of this structure. Whether the two-tower connecting building with large bases is a contour joined bodies structure or not, the top floor displacement and the acceleration of the structure under the effect of the seismic wave EL-CENTRO was bigger than that under the effect of the seismic wave Taft. The occurring time of the top floor's maximum displacement and the acceleration was different under the action of each seismic wave. The research on the change of the damping ratio of the two-tower connecting building with large bases of joined bodies structure which was not contour indicated that the response of the structure increased with the decrease of the damping ratio, and the building's earthquake reaction could be reduced effectively via the setting of the damp. |
